Civil Engineering Applied Mechanics Quiz - Set 23

Practice Test: Question Set - 23

1. M.I. of a thin ring (external diameter D, internal diameter d) about an axis perpendicular to the plane of the ring, is
    (A) π/64 (D4 + d4)
    (B) π/32 (D4 - d4)
    (C) π/32 (D4 + d4)
    (D) π/32 (D4 × d4)

2. A rigid body suspended vertically at a point and oscillating with a small amplitude under the action of the force of gravity, is called
    (A) Simple pendulum
    (B) Compound pendulum
    (C) Second's pendulum
    (D) None of these

3. The maximum frictional force which comes into play, when a body just begins to slide over the surface of a another body, is known
    (A) Sliding friction
    (B) Rolling friction
    (C) Limiting friction
    (D) None of these

4. If the resultant of two forces ‘P’ and ‘Q’ acting at an angle ‘θ’ makes an angle ‘α’ with ‘P’, then tan α equals
    (A) P sin θ/P - Q cos θ
    (B) Q sin θ/P + Q cos θ
    (C) P sin θ/P + Q tan θ
    (D) Q sin θ/P + Q sin θ

5. For maximum range of a projectile, the angle of projection should be
    (A) 30°
    (B) 45°
    (C) 60°
    (D) None of these

6. The angle of projection for a range is equal to the distance through which the particle would have fallen in order to acquire a velocity equal to the velocity of projection, will be
    (A) 30°
    (B) 45°
    (C) 60°
    (D) 75°

7. One half of a vibration of a body, is called
    (A) Period time
    (B) Oscillation
    (C) Beat
    (D) Amplitude

8. Time required to stop a car moving with a velocity 20 m/sec within a distance of 40 m, is
    (A) 2 sec
    (B) 3 sec
    (C) 4 sec
    (D) 5 sec

9. A ball of mass 1 kg moving with a velocity of 2 m/sec collides a stationary ball of mass 2 kg and comes to rest after impact. The velocity of the second ball after impact will be
    (A) Zero
    (B) 0.5 m/sec
    (C) 1.0 m/sec
    (D) 2.0 m/sec

10. The centre of gravity of a plane lamina will not be at its geometrical centre if it is a
    (A) Circle
    (B) Equilateral triangle
    (C) Rectangle
    (D) Right angled triangle

11. If the angle between the applied force and the direction of motion of a body, is between 90° and 180°, the work done, is called
    (A) Virtual work
    (B) Imaginary work
    (C) Zero work
    (D) Negative work

12. If the angle of projection is double the angle of inclination (α) of the plane on which particle is projected, the ratio of times of flight up the inclined plane and down the inclined plane, will be
    (A) ½ cos α
    (B) ½ sin α
    (C) ½ tan α
    (D) 2 cos α

13. In simple harmonic motion, acceleration of a particle is proportional to
    (A) Rate of change of velocity
    (B) Displacement
    (C) Velocity
    (D) Direction

14. When a body falls freely under gravitational force, it possesses
    (A) Maximum weight
    (B) Minimum weight
    (C) No weight
    (D) No effect on its weight

15. In a simple screw jack, the pitch of the screw is 9 mm and length of the handle operating the screw is 45 cm. The velocity ratio of the system is
    (A) 1.5
    (B) 5
    (C) 25
    (D) 314

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